Drum bearing shield



Feb- 17, 195 B. L. MICHAELSON DRUM BEARING SHIELD Filed Aug. 9, 1956HTTORNEY United States Patent DRUM BEARING SHIELD Bernard L. Michaelson,Sioux City, Iowa Application August 9, 1956, Serial No. 603,143

1 Claim. (Cl. 77-55) My invention relates to a drum bearing shield.

An object of my invention is to provide a shield in which a brake drumcan be securely held on a suitable lathe when truing the inner surfaceof the drum, and wherein the iron cuttings from the tool will not beable to pass into the bearings.

A further object of my invention is to provide an arrangement of thistype in which adjustable means are provided for accommodating the deviceto different sizes of attaching members.

A further object of my invention is to provide an arrangement in whichthe spring pressure applied is applied uniformly and smoothly around theshield.

With these and other objects in view, my invention consists in theconstruction, arrangement, and combination of the various parts of mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claim, and illustrated in theaccompanying drawings, in which:

Figure 1 is a longitudinal section of my shield as applied to a brakedrum,

Figure 2 is a sectional view of Figure 3 taken along the lines 22thereof,

Figure 3 is a sectional view of Figure 2 taken along the lines 33thereof.

My invention contemplates the provision of a brake drum shield whichwill efficiently seal the bearing portions of the drum from cuttingsresulting from truing of the inner surface of the drum, and furthercontemplates adjustable means wherein different sized fittings can beaccommodated. I have indicated certain standard portions by dotted linesin order to clarify the details of my invention, and as such I have usedthe character to indicate the cylindrical portion of a brake drum of anautomobile, the character 11 indicating the inner surface which is to betrued with a cutting tool.

I have further used the character 12 to indicate the fabric or othercovering member of a lathe which terminates in the annular member 13,the character 14 indicating a spacer, the character 15 a cone, thecharacter 16 an arbor, the character 17 a further cone, the character 18a spacer, and the character 19 a tightening nut which is engaged withthe threads 20 at the end of the arbor, the cones 15 and 17 beingengaged with the hub portions 21 and 22 of the drum, this arrangementthereby serving to securely hold the drum so that it will rotate withthe lathe portions for the cutting operation.

The character 23 indicates the usual reduced width annular surface whichextends from the recessed portion 24, the inside of the hub portionincluding the usual ball bearings or other bearings which are to beprotected.

The device of my invention comprises an outer cylindrical member 25which is secured at 26 to a ring shaped member 27 having a centralopening 28, and secured to the member 27 is the ring shaped resilientmember 29, and I have further used the character 30 to indicate afurther ring shaped member having the larger opening 31,

Patented Feb. 17, 1959 and attached to the member 30 is the further ringshaped resilient member 32. The member 30 received within the end of thecylindrical member 25 and can be removed therefrom.

Attached as at 33 to the ring shaped member 27 are the lengthened bolts34 of which there are preferably three, equally spaced as shown, andreceiving the bolts 34 are the helical springs 35 which normally hear at36 against a further ring shaped member 37 having the central opening38, the ring shaped member 37 having small opening 39 for allowing freepassage of the bolts 34, and threada'bly attached at the ends of thebolts 34 are the nuts 40.

In using my device, the end portion 13 of the lathe is pressed firmlyagainst the disk 3'7 which disk will compress the springs 35 a certainamount, which in turn will cause the resilient member 32 to tightly bearagainst the annular portion 23, so that when the entire brake drumturns, and as the tool cuts into the surface 11, it will be impossiblefor the cuttings to get into the bearings within the hub portion 22,etc. The various other members such as the cones 15 and 17 are assembledas explained above.

In many cases when a larger arbor is used, or when larger securing cones15 are used, the outer member 30 can be pulled out of the cylindricalmember 26, and the inner member 23 will be used with the resilient ring29 being pressed against the annular surface 23, this arrangementthereby providing an adjustable feature for varying sizes of attachingmeans such as cones or other devices, it being further noted that thesedifierent sized end rings will also accommodate varying hub sizeswithout the necessity of using a separate shield.

The equally spaced springs 35 provide means for maintaining a uniformpressure against the hub surface, and in a simple construction. Thelength of the bolts 34 permit the unit to be used at a variety ofdesired spacings between the portion 13 and the hub portion 23 withsuflicient compression in the springs to provide a tight joint whererequired, and it will now be noted that I have provided the advantagesmentioned in the objects of my invention with further advantages beingapparent.

Some changes may be made in the construction and arrangement of theparts of my invention without departing from the real spirit and purposeof my invention, and it is my intention to cover by my claim anymodified forms of structure or use of mechanical equivalents which maybe reasonably included within their scope.

I claim as my invention:

A drum bearing shield for turning lathes comprising an annular end ringhaving a resilient facing for bearing against a drum hub end, a furtherring abutting against said end ring, said end ring and said further ringhaving different sized central openings for accommodating differentsized fittings, a still further ring spaced from said end ring and saidfurther ring, a cylindrical guard receiving all of said rings,peripherally and equally spaced bolts attached to said further end ring,said bolts passing through said still further ring, helical springsreceiving said bolts and bearing against said further ring and saidstill further ring, nuts attached to the inner terminals of said boltsfor limiting movement of said still further ring, said end ring and saidfurther ring being secured to said cylindrical shield, said stillfurther ring having a central opening in longitudinal alignment withsaid different sized openings.

References Cited in the file of this patent FOREIGN PATENTS 560,720Great Britain Apr. 18, 1944

